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gpt-auto-generator: make it easier to notice if boot loader support is missing

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The docs didn't talk about this, so let's add an explicit mention that the
boot loader must cooperate. And also make the message from the generator
notice level. This should help people who are trying to mix grub and the
gpt auto logic.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2019-11-28 18:21:22 +01:00
parent 1fac34b941
commit b50a3a1565
2 changed files with 15 additions and 11 deletions
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23
man/systemd-gpt-auto-generator.xml
View File

@ -35,7 +35,7 @@
root, <filename>/home/</filename>, <filename>/srv/</filename>, the EFI System Partition, the Extended
Boot Loader Partition and swap partitions and creates mount and swap units for them, based on the
partition type GUIDs of GUID partition tables (GPT), see <ulink
url="https://uefi.org/specifications">UEFI Specification</ulink>, chapter 5. It implements the <ulink
url="https://uefi.org/specifications">UEFI Specification</ulink>, chapter 5. It implements the <ulink
url="https://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/">Discoverable Partitions
Specification</ulink>. Note that this generator has no effect on non-GPT systems, and on specific mount
points that are directories already containing files. Also, on systems where the units are explicitly
@ -44,18 +44,21 @@
units this generator creates are overridden, but additional implicit dependencies might be
created.</para>
<para>This generator will only look for root partitions on the
same physical disk the EFI System Partition (ESP) is located on.
It will only look for the other partitions on the same physical
disk the root file system is located on. These partitions will not
be searched for on systems where the root file system is distributed
on multiple disks, for example via btrfs RAID.</para>
<para>This generator will only look for the root partition on the same physical disk the EFI System
Partition (ESP) is located on. Note that support from the boot loader is required: EFI variable
<varname>LoaderDevicePartUUID-4a67b082-0a4c-41cf-b6c7-440b29bb8c4f</varname> is used to determine from
which partition, and hence the disk from which the system was booted. If the boot loader does not set
this variable, this generator will not be able to autodetect the root partition.</para>
<para><filename>systemd-gpt-auto-generator</filename> is useful
for centralizing file system configuration in the partition table
and making configuration in <filename>/etc/fstab</filename> unnecessary.
<para>Similarly, this generator will only look for the other partitions on the same physical disk as the
root partition. In this case, boot loader support is not required. These partitions will not be searched
for on systems where the root file system is distributed on multiple disks, for example via btrfs RAID.
</para>
<para><filename>systemd-gpt-auto-generator</filename> is useful for centralizing file system
configuration in the partition table and making configuration in <filename>/etc/fstab</filename> or on
the kernel command line unnecessary.</para>
<para>This generator looks for the partitions based on their
partition type GUID. The following partition type GUIDs are
identified:</para>

3
src/gpt-auto-generator/gpt-auto-generator.c
View File

@ -612,7 +612,8 @@ static int add_root_mount(void) {
r = efi_loader_get_device_part_uuid(NULL);
if (r == -ENOENT) {
log_debug("EFI loader partition unknown, exiting.");
log_notice("EFI loader partition unknown, exiting.\n"
"(The boot loader did not set EFI variable LoaderDevicePartUUID.)");
return 0;
} else if (r < 0)
return log_error_errno(r, "Failed to read ESP partition UUID: %m");